Storybook: Add stories for AlignmentToolbar and AlignmentControl components

packages/block-editor/src/components/alignment-control/stories/aliginment-toolbar.story.js

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+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { AlignmentToolbar } from '..';
+
+/**
+ * The `AlignmentToolbar` component renders a dropdown menu that displays alignment options for the selected block in `Toolbar`.
+ */
+const meta = {
+	title: 'BlockEditor/AlignmentToolbar',
+	component: AlignmentToolbar,
+	argTypes: {
+		value: {
+			control: { type: null },
+			defaultValue: 'undefined',
+			description: 'The current value of the alignment setting.',
+		},
+		onChange: {
+			action: 'onChange',
+			control: { type: null },
+			description:
+				"A callback function invoked when the toolbar's alignment value is changed via an interaction with any of the toolbar's buttons. Called with the new alignment value (ie: `left`, `center`, `right`, `undefined`) as the only argument.",
+		},
+	},
+};
+export default meta;
+
+export const Default = {
+	render: function Template( { onChange, ...args } ) {
+		const [ value, setValue ] = useState();
+		return (
+			<AlignmentToolbar
+				{ ...args }
+				onChange={ ( ...changeArgs ) => {
+					onChange( ...changeArgs );
+					setValue( ...changeArgs );
+				} }
+				value={ value }
+			/>
+		);
+	},
+};

packages/block-editor/src/components/alignment-control/stories/index.story.js

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+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { AlignmentControl } from '../';
+
+/**
+ * The `AlignmentControl` component renders a dropdown menu that displays alignment options for the selected block.
+ *
+ * This component is mostly used for blocks that display text, such as Heading, Paragraph, Post Author, Post Comments, Verse, Quote, Post Title, etc... And the available alignment options are `left`, `center` or `right` alignment.
+ *
+ * If you want to use the alignment control in a toolbar, you should use the `AlignmentToolbar` component instead.
+ */
+const meta = {
+	title: 'BlockEditor/AlignmentControl',
+	component: AlignmentControl,
+	argTypes: {
+		value: {
+			control: { type: null },
+			defaultValue: 'undefined',
+			description: 'The current value of the alignment setting.',
+		},
+		onChange: {
+			action: 'onChange',
+			control: { type: null },
+			description:
+				"A callback function invoked when the toolbar's alignment value is changed via an interaction with any of the toolbar's buttons. Called with the new alignment value (ie: `left`, `center`, `right`, `undefined`) as the only argument.",
+		},
+	},
+};
+export default meta;
+
+export const Default = {
+	render: function Template( { onChange, ...args } ) {
+		const [ value, setValue ] = useState();
+		return (
+			<AlignmentControl
+				{ ...args }
+				onChange={ ( ...changeArgs ) => {
+					onChange( ...changeArgs );
+					setValue( ...changeArgs );
+				} }
+				value={ value }
+			/>
+		);
+	},
+};